MODULE feedback ;

(*
   m2-GTK4 example - progress, spinner, separator and image.

   A progress bar fills from 0 to 1 on a timer while a spinner runs;
   when it completes the spinner stops and the bar reads "Done".

   Build:  make examples
   Run:    ./build/examples/feedback
*)

FROM Gio IMPORT g_application_run;
FROM GtkApplication IMPORT gtk_application_new;
FROM GtkWindow IMPORT gtk_application_window_new, gtk_window_set_title,
   gtk_window_set_default_size, gtk_window_set_child, gtk_window_present;
FROM GtkBox IMPORT gtk_box_new, gtk_box_append, gtk_box_set_spacing;
FROM GtkEnums IMPORT GtkVertical, GtkHorizontal;
FROM GtkWidget IMPORT gtk_widget_set_margin_top,
   gtk_widget_set_margin_bottom, gtk_widget_set_margin_start,
   gtk_widget_set_margin_end;
FROM GtkProgressBar IMPORT gtk_progress_bar_new, gtk_progress_bar_set_fraction,
   gtk_progress_bar_set_show_text, gtk_progress_bar_set_text;
FROM GtkSpinner IMPORT gtk_spinner_new, gtk_spinner_start, gtk_spinner_stop;
FROM GtkSeparator IMPORT gtk_separator_new;
FROM GtkImage IMPORT gtk_image_new_from_icon_name;
FROM GLib IMPORT g_timeout_add, GSourceRemove, GSourceContinue;
FROM GtkClosures IMPORT Connect2;
FROM SYSTEM IMPORT ADDRESS;
FROM libc IMPORT printf;

CONST
   AppId = "org.example.m2gtk4.Feedback";

VAR
   progress, spinner: ADDRESS;
   fraction: REAL;

PROCEDURE OnTick (data: ADDRESS) : INTEGER;
BEGIN
   fraction := fraction + 0.05;
   IF fraction >= 1.0 THEN
      gtk_progress_bar_set_fraction(progress, 1.0);
      gtk_progress_bar_set_text(progress, "Done");
      gtk_spinner_stop(spinner);
      RETURN GSourceRemove
   ELSE
      gtk_progress_bar_set_fraction(progress, fraction);
      RETURN GSourceContinue
   END
END OnTick;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   window, box: ADDRESS;
BEGIN
   fraction := 0.0;

   progress := gtk_progress_bar_new();
   gtk_progress_bar_set_show_text(progress, 1);
   gtk_progress_bar_set_fraction(progress, 0.0);

   spinner := gtk_spinner_new();
   gtk_spinner_start(spinner);

   box := gtk_box_new(GtkVertical, 12);
   gtk_box_set_spacing(box, 12);
   gtk_widget_set_margin_top(box, 14);
   gtk_widget_set_margin_bottom(box, 14);
   gtk_widget_set_margin_start(box, 14);
   gtk_widget_set_margin_end(box, 14);
   gtk_box_append(box, gtk_image_new_from_icon_name("application-x-executable"));
   gtk_box_append(box, progress);
   gtk_box_append(box, gtk_separator_new(GtkHorizontal));
   gtk_box_append(box, spinner);

   window := gtk_application_window_new(application);
   gtk_window_set_title(window, "m2-GTK4 Feedback");
   gtk_window_set_default_size(window, 360, 200);
   gtk_window_set_child(window, box);
   gtk_window_present(window);

   g_timeout_add(100, OnTick, NIL)
END OnActivate;

VAR
   app: ADDRESS;
BEGIN
   app := gtk_application_new(AppId, 0);
   IF app = NIL THEN
      printf("gtk_application_new failed\n");
      HALT(1)
   END;
   Connect2(app, "activate", OnActivate, NIL);
   g_application_run(app, 0, NIL)
END feedback.